Reference for Pesachim 168:17

הראוי למזבח אין בו משום שבירת העצם

while on the view that [only what is] fit for eating [is subject to this law], now [however] it is not fit for eating. R'Nahman B'Isaac said: In such a case all agree that it is subject to the [prohibition of] breaking a bone What is the reason?

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